Chicago-latrobe 50911 Screw Machine Drill Bit 0.0465 in

Product Description

The CHICAGO-LATROBE 50911 is a screw machine length cobalt drill bit designed for high-performance drilling in ferrous metals, cast iron, and steel. Built to Series 559 heavy-duty standards, this bit features a 135-degree split point that reduces walking and allows for clean entry without a center punch. The web-thinned, parallel web construction reduces thrust during penetration. At 0.0465 inches in diameter (Wire Size 56), it delivers tight-tolerance drilling with a diameter tolerance of +0.0000 to -0.0005 inches. Manufactured from M42 cobalt, this bit handles elevated heat and maintains edge integrity at cutting speeds that would degrade standard high-speed steel tooling.

This bit is suited for production machining and fabrication environments where short, rigid tooling is preferred over jobber-length bits. Screw machine length bits are commonly used in drill presses, CNC turret lathes, screw machines, and gang drill setups. The right-hand spiral flute and straight cylindrical shank ensure compatibility with standard chuck configurations. Primary workpiece materials include cast iron and steel, making this bit a go-to for metal fabrication shops, maintenance machinists, and production line tooling setups where small-diameter precision holes are required on a repetitive basis.

Key Features

• M42 cobalt material grade for heat resistance and extended tool life in ferrous metals
• 135-degree split point reduces thrust and eliminates center-punching on most metals
• Web-thinned parallel web construction lowers cutting resistance
• Tight diameter tolerance of +0.0000 to -0.0005 inches for precision hole sizing
• Screw machine length body provides added rigidity compared to jobber-length equivalents
• ISO standards compliant, heavy-duty grade designation

Compatibility

Designed as a screw machine length replacement or production tooling option for applications requiring Wire Size 56 (0.0465 inches) diameter holes in cast iron and steel workpieces. Compatible with standard straight-cylindrical shank chucks across drill presses, CNC turret lathes, and screw machine setups.

Installation Notes

This bit is intended for use by machinists and production tooling professionals. Secure the straight cylindrical shank fully in the chuck before operation and verify runout with appropriate measuring tools if tolerance-critical holes are required. Use cutting fluid or coolant appropriate for the workpiece material to extend tool life, noting this bit does not support coolant-through configurations. Inspect the cutting edges for wear regularly, as small-diameter cobalt bits can chip if feed rates or speeds are not matched to the workpiece material.